James g



(No Model.)

J. G. HOYT. PRINTING MACHINE.

No. 573,595. Patented Dec. 22, 1896.

Inventor.

I G/layl" Witnesses.

Attorney.

NE mums versus an. Pumaumm wnswmu'rcwm ck UNITED STATES PATENT OFFICE.

JAMES G. HOYT, OF BROOKLYN, NE\V YORK, ASSIGNOR TO THE CAMPBELL PRINTINGPRESS AND MANUFACTURING COMPANY, OF NElV YORK, N. Y.

PRINTING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 573,595, dated December22, 1896.

Application filed April '7, 1891. Serial No. 387,939. (No model.)

To all whom it may concern.-

Be it known that I, JAMES G. HOYT, of Brooklyn, in the county of Kingsand State of New York, have invented a new and usef ul Improvement inPrinting-Machines,which invention is fully set forth and illustrated inthe following specification and accompanying drawings.

The object of this invention is to construct a machine capable ofprinting rapidly and simply from gelatin and other plates requiring theinterposition of a mask-sheet or frisket.

The invention will first be described in detail, and then particularlyset forth in the I 5 claims.

In printing from gelatin and certain other kinds of plates it isnecessary to interpose a mask-sheet between the plate and the sheet tobe printed in order that certain parts of the sheet, the margins, forinstance, may be protected from the soiled surface of the plate. Such amask is prepared by cutting in paper or other suitable material openingsof the proper shape and size in order that the sheet to be printed maybe exposed through these openings in proper parts to the plate.

The accompanying drawings show the best way now known to me for carryingout my invention, referring to which Figure 1 is a sectional elevationshowing the parts of a printing-machine necessary for the illustrationof this invention; and Fig. 2 shows amodified construction of frisket,hereinafter referred to.

3 5 In said drawings the several parts are respectively indicated byreference numbers and letters as follows:

The number 1 indicates the impression-cylinder of a printing-machine ofthat class in which the cylinder oscillates through geared contact witha reciprocating bed; 2, the printing-plate fastened upon said bed; 3, acylinder connected by gearing to impression-cylinder 1 and supportingthat portion of the mask 13 not wound about said impression-cylinder;

4, the sheet-gripping device held in a gap in the surface of cylinder 1and operated in any of the many well-known ways; 5, the feedboard fromwhich the sheet is fed to the gripping device 4; 6, a switch or stripperso placed that upon the return movement of the impression-cylinder 1 itwill enter the path of the printed sheet and divert the same, tailfirst, toward the cylinder 3; '7, an endless tape or tapes running overor around three pulleys a b c, as shown, and bearing upon cylinder 3 forthe purpose of holding the printed sheet to its path about saidcylinder; 8, a switch or stripper operating to divert the sheet from thecylinder 3 to the fly mechan- 6o ism 9, which, turning about its center,operated by any of the well-known means, deposits the sheet upon areceiving-table 12; 10, a guide to which the sheet is fed while uponfeed-board 5; and 11, a portion of they main frame or housing of themachine, the remainder of which frame has been cut away to better exposethe working parts.

The number 13 indicates a mask-sheet or frisket, one end of which isattached to a point upon the impression-cylinder 1, the other lying uponand over the cylinder 3 and preferably attached thereto.

The mechanism for imparting motion to the bed and cylinder and inkingapparatus is not 7 5 shown, as, these members may be operated in manyways well known to the art.

The switches 6 and 8 may be operated by any of the usual cammechanis1ns,as indicated in dotted lines. So

The printing-press thus far described consists of the ordinaryoscillating cylinder, reciprocating-bed press, in which theimpression-cylinder is geared to the reciprocating bed, as indicated indotted lines, and in which the impression-cylinder is raised clear ofthe form or plate on the back stroke. The impression-cylinder 1 and thecylinder 3 are geared together, as indicated in dotted lines. Theprinting plate or form receives ink from the rollers at the left of theimpression-cylinder, and, if desired, damping-rollers may be placed atthe right of the impression-cyh inder.

The operation of the machine is as follows: A sheet to be printed istaken upon cylinder 1 from the feed-board 5 by grippers 4: and thereheld while said cylinder rotates to meet the advancing printing-plate 2.As the sheet held by said grippers descends it is cov- 10o ered by themask-sheet 13, which is cut so as to expose the sheet to and protect thesheet from various portions of said printing-plate. Having passed thepoint of contact with the said printing-plate, the 110w printed sheet,being still held upon cylinder 1 and covered by the mask-sheet 13,(which latter is wound upon cylinder 1, as before described,) while thebed carrying the plate 2 finishes its movement toward the rear of themachine and returns, thereby changing the direction of the rotation ofthe cylinder 1, is carried, tail first, and still covered by the mask,toward the switch or stripper 6. Just previous to reach ing said switchthe mask-sheet 13 leaves contact with cylinder 1, being taken up overcylinder 3, and the printed sheet at about the same point is switchedfrom cylinder 1, tail first, by said switch, so that it follows thecourse of the mask-sheet 13 over cylinder 3. Upon the surface ofcylinder 3 where it lies upon the mask the sheet is held by tapes 7until it reaches switch 8, when it is directed thereby upon fly 9, whichlays it upon the table 12, the stripper 8 being preferably arranged justso as to pick up the tail of the sheet from the mask and then toslightly raise, so that the sheet will be guided out over the switch,but so that the switch will not bear against or derange the mask. Themask need not of necessity be a sheet. It may consist of strips ofmaterial stretched between two plates-or bands, as 130, Fig. 2.

It is obvious that my invention is applicable to a machine in which acurved printingplate is used. It will also be seen that with my improvedarrangement I can use a front delivery, that is, place the deliverymechanism at the front of the press, or on the other side of thecylinder relatively to the feedboard, and not under the feed-board.

I am aware that a frisket or mask-sheet operated to reel and unreelabout an oscillating cylinder is not new, and therefore I do not claimsuch; but as of my invention I claim- 1. In an oscillating-cylinderprinting-press, the combination of the impression-cylinder, a mask-sheetor frisket attached at one end to said cylinder, and an oscillatingsupporting-cylinder for said frisket, substantially as described.

2. In an oscillating-cylinder printing-press, the combination with theimpression-cylinder, a mask-sheet or frisket attached atone end thereto,a suitable supporting device for the mask-sheet or frisket, the whole soarranged that the mask-sheet or frisket will move with theimpression-cylinder, and a suitable switch adapted to divert the sheetfrom the impression-cylinder as the cylinder makes its non-printingmovement, substantially as described.

3. In an oscillating-cylinder printing-press, the combination of thefeed-board, the impression-cylinder, a mask-sheet or frisket secured atone end to said cylinder, and adapted to move therewith, a supportingdevice for said mask-sheet and a delivery mechanism arranged on theother side of the cylinder relatively to the feed-board, to which thesheet passes tail first, substantially as described.

4. In an oscillating-cylinder printing-press, the combination with theimpression-cylinder, a mask-sheet or frisket secured thereto, means forcarrying the part of the masksheet or frisket not on theimpression-cylinder, the whole so arranged that the masksheet or frisketwill move with the impressioncylinder, means for diverting the sheet ontop of the mask-sheet, as the cylinder makes its non-printing movement,and means for delivering the sheet from the top of the masksheet,substantially as described.

5. In an oscillating-cylinder printing-press, the combination with theimpression-cylinder, a mask-sheet or frisket secured thereto, means formanipulating the mask-sheet so that the same will move with theimpressioncylinder, and a delivery mechanism adapted to receive theprinted sheet tail first from the mask, and deliver the same,substantially as described.

JAMES G. HOYT. Vitnesses:

THEO. H. FRIEND, FRANCIS P. REILLY.

